Liverpool mayor Ned Mannoun met with Mr Greiner on Thursday to discuss the implications for the community of new regional infrastructure.

Cr Mannoun said Mr Greiner, who supported the proposed development, agreed upgrades were needed, but could not determine who would foot the bill.

"His [Nick Greiner's] position is clear on it, it always has been — he supports the intermodals," Cr Mannoun said.

"But in a big move he did agree there needed to be significant road upgrades.

"At future meetings I hope to really raise the issue of who will be responsible for financing these vital upgrades."

Cr Mannoun's meeting with Mr Greiner coincided with calls from University of Western Sydney urban planner, Peter Phibbs, for the state and federal governments to end the squabbling over where to put Sydney's second airport and commit to the most convenient site at Badgerys Creek.

While Professor Phibbs says building an airport at Badgerys Creek will generate significant economic benefits for the region, Liverpool councillors are firm in their opposition to the airport.

Cr Mannoun said the decision rested with the federal government and he did not support the idea.

"In my meeting with Nick Greiner he gave me the sense he wasn't really pushing for an airport out there, but he did say, economically, it would be great for western Sydney," he said.